Yep, this is what we see as well. 1/4 of our site has YPN and it just passed up the other 3/4 with Adsense. Still want to take it slowly as I don't want all the eggs in one basket, but am slowly switching over.
I get clicks as high as $56 on my adsense website. YPN gives me very low CPM but more consistent numbers. the site I have on YPN makes 5 to 10 dollars a day. Not bad for me.
Either way, I hate google. I just hate their guts. That is why I would love to see YPN do well and take over. Google has become the centre of publisher abuse for many of us and I have had enough with them. They have become too complacent.